Java LinkedBlockingDeque element() method

The element() method of LinkedBlockingDeque class returns the head of the queue corresponding to this deque but does not withdraw it. The result returned by this method is similar to the one returned by getFirst() method.

Syntax:

Parameters:

NA

Specified By:

The element() method of LinkedBlockingDeque class is specified by:

• element() method in interface BlockingDeque<E>.
• element() method in interface Deque<E>.
• element() method in interface Queue<E>.
• element() method in interface AbstractQueue<E>.

Overrides:

The element() method of LinkedBlockingDeque class is overrided by element() method in class AbstractQueue<E>.

Return Value:

The element() method returns the head of the queue corresponding to this deque.

Throws:

The element() method throws NoSuchElementException, if this deque is empty.

Example 1

Output:

Head of the Queue is : Harish

Example 2

Output:

Hinna got 97 marks.
Vinni got 87 marks.
Rima got 77 marks.
Topper of the class is Hinna

Example 3

Output:

Exception in thread "main" java.lang.NullPointerException
	at java.util.concurrent.LinkedBlockingDeque.offerLast(LinkedBlockingDeque.java:357)
	at java.util.concurrent.LinkedBlockingDeque.addLast(LinkedBlockingDeque.java:334)
	at java.util.concurrent.LinkedBlockingDeque.add(LinkedBlockingDeque.java:633)
	at com.TpointTech.LinkedBlockingDequeElementExample3.main(LinkedBlockingDequeElementExample3.java:9)